Note: the bands only FIT for Garmin vivo smart HR+ (approach X40) tracker, indeed do not fit Garmin vivo smart HR and other devices! ! ! Garmin vivo smart HR and vivo smart HR+ are different device. Their bands are not compatible. Please make clear your tracker model and make right orders. Thanks a lot! ! ! Material: made of high quality TPE + TPU rubber. Silicone material with metal clasps. Size: The gamin vivo smart HR+ Accessory is one size fits most wrists, designed to fit most wrists (size: 5. 7 inches. 26 inch/145-210mm. )The issues you might meet while you buy and wear the bands: tithe band side that has the hole in it for the button does not even come close to fitting correctly. A: you might install oppositely the band sides. You can try to change the band side over then install again. Q: Does not fit my germinal: the bands only FIT for Garmin vivo smart HR+ tracker. Do not fit for Garmin vivo smart HR and other devices! ! ! My dear friends, please make clear your wearing tracker model and make orders. If the band still can't fit your vivo smart HR+, please contact us. We will try our all to solve this problem. Q: item does not fit Watch. Does not allow screws to be installed. A: before we listed This Bands, We installed some bands to Device by ourselves. The screws can be installed. We think the band can't compatible with the device or you can be more patient. Q: is it OEM? A: it is not OEM. It is not original item. It is just a replacement listed by tencloudhere are few color aberrations between the products' Images and the material objects, we apologize for it. Don't hesitate to contact ten cloud seller, we will try our best to meet your needs. Recently, some friends complain the band can't fit their tracker. So we kindly mention: please clear out your tracker's model before placing an order. Cause the band can't fit Garmin vivo smart HR, The band's partner is only one-vivo smart HR. +(Hr. Plus)! !